4. A father wants to share gifts to 7 children who won with each 1 (one) cellphone, while the rest as a backup. The handhone consists of 6 iPhone brands, 3 Vivo brands, and 5 infinix brands. How many opportunities that the handphone given is a). 4 iPhone brands, and 3 infinix brands b). 2 Among the iPhone brands after being known 1 Vivo brand has been given to his child.

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A:

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